qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
Elyse - The free version allows up to 30 tags.
µTorrent - Looking for a torrent site to download movies, music and more? Choose from top torrent sites like The Pirate Bay, RARBG, 1337X, and dozens more. (October 2019)
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
Leap - With Leap you find things based on your natural memory of that file.